Reciprocatory hand tool for flexible shafts



July 12, 1932.

M. J. FARKAS RECIPROCATORY HAND TOOL FOR FLEXIBLE SHAFTS Filed May 5,1931 fnapnfor Patented July 12, 1932 UNITED STATES- MICHAEL J. FARKAS,OF BRIDGEPORT, CONNECTICUT BECIIPROCATO RY HAND TOOL FOR FLEXIBLE SHAFTSApplication filed m 5, 1931. Serial No. 535,197.

My invention relates to reciprocatory hand tools but more particularlyhas reference to such tools as are operated by means of flexible shaftconnections, so that the tool may of the rotary member is a keeper begrasped by hand and manipulated in any desired manner.

In the accompanying drawing which is to be read as a part of thisdescription Figure 1 is an elevation of the completed hand tool with anysuitable tool secured therein, in the present instance, a saw,

Figure 2 is a section at the line 22 of Figure l, and

Figures 3, 4 and 5 are respectively sections at the lines 3-3, 44=, and5-5 of Fi ure 2.

gimilar numerals of reference denote like parts in the several figuresof the drawing.

1 is a stationary cylindrical casing having at its front end a threadedreduced portion 2, and 3 is a rotary member mainly contained within thecasing and having a reduced hollow shank 4 extending from its rear andthreaded at its outer end for the purpose presently to be explained.

3 are ball bearings 6, the threaded adjust ment bet-ween the casing 1and block 5 being such that these bearings will easily function in theusual manner. Driven on the threaded rear end of the reduced ortion 4and between the latter and the rear end of the block 5 are ball bearings8, the adjustment of this keeper being such that these bearings willeasily function in the usual manner. 9 is a nut driven on the threadedend of the portion 4 against the keeper 7, and 10 is a am nut driven onsaid portion against the nut 9 so that it will be clear that the keeper7 will always preserve its proper position.

11 is the rear casing interiorly threaded at its front end and securedby a left hand thread to the rear end of the block 5, and this casinghas tapped within its rear end a block 12 which is hollow and throughwhich extends a shaft 13 whose forward terminal is flattened so as to behalf round, as seen at 14, and against this flattened surface 14 is ablock 15 which extends through an opening in the portion 4, the outersurface of this block being threaded as a continuation of the threads onthe rear end of said portion, and the driving of the keeper 7 on the endof the portion 4 serves to keep this block in posit-ion, so that anyrotary movements of the shaft 13 will be communicated to the block andlikewise to the rotary member 3.

It will thus be noted that this rotary member has ball bearings both atthe front and rear of the block 5 so that said member will revolve quitefreely.

The shaft 13 is connected to a flexible shaft in any suitable manner,and as the flexible shaft would receive its rotation from any suitablemotor, it will be clear that the rotary member will be readily operated.

The front end of this rotary member is hollow and provided with asuitable tight bushing 16, within which latter is a member 17 capable offree reciprocations.

At spaced locations around this member 17 and in the reduced portion 2of the stationary casing 1 are circular elongated channels 18 and 19respectively, and within these grooves are steel balls 20 which not onlylook the member 17 as against rotation but facilitate the reciprocatorymovements of such member.

A felt washer 21 surrounds the member 17 immediately in front of theballs 20, and a keeper ring 22 likewise surrounds said mem her and has ashoulder 23 that abuts the Washer 21, and a threaded nozzle 24 is drivenon the threads of the portion 2 and has a shoulder 25 which is therebyforced firmly against the shoulder 23 thus binding the washer 21 againstthe end of the portion 2,

whereby not only is dirt excluded from the a saw 28 has its tang 29secured within said holder by a set screw 30 or otherwise.

An inclined annular groove 31 is formed around the reciprocatory member17 and a set screw 32 having a socket 33 in its inner end is driventhrough the rotary member 3, a steel ball 34 being assembled within saidsocket and propelled by the screw into the groove 31, the ball beingcontained half way in the socket and half way in the groove, and

the set screw bein driven only far enough to prevent the ball rombinding in the groove but allowing it free movement therein. Anysuitable means, as a wire 35, engaged within the slot of the screw andtight around the rotary member 3, is employed to hold the screwstationary after its proper adjustment, so that it will readily beunderstood that when the member 3 revolves it will cause lengthwisereciprocations of the member 17 and the tool carried thereby.

While the invention has been described in detail, it will be clear thatthere may be various modifications employed all within the range ofordinary mechanical skill without departing from the spirit of theinvention.

What is claimed is 1. A reciprocating tool holder and mechanism,comprising a hollow stationary casing having a reduced hollow shankportion extending from its front end, a hollow rotary member having areduced hollow shank ortion extending from its rear end con ned thereincontaining the reciprocating mechanism, a block bearing spaced from andsurrounding the hollow rear shank portion, ball bearings arranged ateach end of the block, one set of ball bearings being arranged to bearagainst the hollow rotary member, the

40 other set being arranged to bear against a keeper driven on the outerend of the hollow rear shank portion.

2. A device of the character described in claim 1, having areciprocatory member within said rotary member, means for preventingrotation of the reciprocatory member, a tool holder carried at the endof the latter, and interengaging means associated with said rotarymember and reciprocatory member for causing lengthwise reciprocations ofthe latter.

In testimony whereof I afiix my signature hereto. MICHAEL J. .FARKAS.

